Friedrich Waismann, a member of the Vienna Circle, resided at Fruchtgasse 3 in Vienna’s second district. Between 1927 and 1936, he engaged in a series of discussions with Ludwig Wittgenstein and soon came to serve as a kind of "spokesperson" for Wittgenstein in relation to the Vienna Circle. Wittgenstein, however, disclaimed any responsibility for Waismann’s interpretations and later distanced himself from him entirely. Waismann’s notes were published posthumously in 1967.
Source: Janik, A.S., & Veigl, H. (1998). Wittgenstein in Wien. Ein biographischer Streifzug durch die Stadt und ihre Geschichte. Springer.
